One of the great areas for a pit stop on your way down the Overseas Highway is the Whale Harbor Channel. It is a beautiful area and the water here is packed with boaters. This is the main channel to take you in and out from the oceanside sandbar and the Backcountry Fishing zones. There's a bunch of good areas around here to do things, especially if you have your bicycles and can paddle around and explore a super Prime Time area to get a hotel. We liked upper keys a lot because of the diving is so good. Our recommendation is to use the Rainbow Reef Dive company. Some of the world's best scuba diving starts right off the coast of Key Largo. The area is fun and inviting, with so many unique places to go snorkel or dive. Probably the most interesting thing we saw the whole time was the Carysfort Reef. This gun ship sank in 1770. It has mooring buoys surrounding the lighthouse and is approximately six miles out from the coastline at approximately mile marker 111.